<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 添加角色 -->
      <el-button type="primary">添加角色</el-button>
      <el-table :data="roleList" border stripe>
          <!-- 展开列 -->
        <el-table-column type="expand">
            <template slot-scope="scope">
              <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                  <!-- 渲染一级权限 -->
                <el-col :span="5" >
                   <el-tag closable @close="removeRightById(scope.row, item1.id)"> {{item1.authName}}</el-tag>
                   <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 渲染二级三级权限 -->
                <el-col :span="19">
                    <!-- 通过for循环渲染二级权限 -->
                    <el-row :class="[i2 ===0 ? '': 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                      <el-col :span="6">
                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                        <i class="el-icon-caret-right"></i>
                      </el-col>
                      <el-col :span="18">
                          <el-tag type="warning"  v-for="(item3) in item2.children" :key="item3.id"  closable @close="removeRightById(scope.row, item3.id)">
                              {{item3.authName}}
                          </el-tag>
                      </el-col>
                    </el-row>
                </el-col>
              </el-row>
            </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
               <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
               <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
               <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限对话框 -->
    <el-dialog
    title="分配权限"
    :visible.sync="setRightDialogVisible"
    width="50%"
    @close="setRightDialogClosed"
    >
  <!-- 树形结构 -->
  <el-tree :data="rightslist" :props="treeProps"  show-checkbox node-key="id" default-expand-all :default-checked-keys="defkeys" ref="treeRef"></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 所有角色的列表数据
      roleList: [],
      // 控制分配权限的显示隐藏
      setRightDialogVisible: false,
      //   所以权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //   默认选中的节点id值数组
      defkeys: [],
      //   当前即将分配权限的角色id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败')
      }
      // 获取数据成功，把数据保存到relesList中
      this.roleList = res.data
      console.log(this.roleList)
    },
    // 根据id删除对应的权限
    async removeRightById (role, rightId) {
    // 弹框是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.err0r('删除失败')
      }
      //   this.getRolesList()  会发生页面的完整渲染
      role.children = res.data
    },
    // 展示分配权限对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败')
      }
      //   把获取到的权限数据保存到data中
      this.rightslist = res.data
      console.log(this.rightslist)
      //   递归获取三级节点的id
      this.getLeafKeys(role, this.defkeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id并保存到defkeys
    getLeafKeys (node, arr) {
    // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      this.defkeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idstr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idstr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="scss" scoped>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>
